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Table 3 The rate of screw perforation

From: A novel patient-specific three-dimensional-printed external template to guide iliosacral screw insertion: a retrospective study

  Grade 0 Grade 1 Grade 2 Perforation P value
Template group 97.4% 2.6% 0% 5.3% < 0.001*
S1 (n) 19 1 0   
S2 (n) 18 0 0   
Conventional group 86.7% 6.7% 6.7% 13.7%  
S1 (n) 14 1 1   
S2 (n) 12 1 1   
  1. *Fisher’s exact test; p < 0.05 considered statistically significant